Sound recording apparatus



April 11, 1939. 1. H. GOLDMAN 2,153,751

S OUND RECORDING APEARATUS Filed Jan. 26, 1938 45, 7 mnnnnnnnnnnnnnnnu. .56 i0 I ,50 ('1- I 58 151D ORE H. GOLDMAN lNVENTOR Mimw ATTORNEY Patented Apr. 11, 1939 UNITED STATES PATENT OFFICE 4 Claims.

This invention relates generally to sound recording or combined sound recording and playing apparatus; but more specifically to yieldable and pivotal means for securing the overhead feed mechanism to the panel of the apparatus.

The main object of the invention resides in the provision of pivotal and yieldable securing means for the overhead feed mechanism carrying the cutting head assembly whereby any displacement in the position of the central pin on the turntable is compensated by a movement along the axis of the cutting head assembly.

A further object of the invention resides in the provision of a yieldable and pivotal securing means for the overhead feed mechanism whereby any eccentricity of the central pin on the turntable relative to the position of the mounting means for the overhead feed mechanism is automatically compensated for without the inducement of any stresses and strains in the feed mechanism.

These objects and other incidental ends and advantages of the invention will hereinafter appear in the progress of the disclosure and as pointed out in the appended claims.

Accompanying this specification is a drawing showing a preferred form of the invention wherein corresponding reference characters designate corresponding parts throughout the several views and wherein:

Figure 1 is a top plan view of the apparatus showing the overhead feed mechanism pivotally and yieldably mounted.

Figure 2 is a side elevation of Figure 1.

Figure 3 is a sectional view of Figure 1 through the plane 3-3 thereof.

Figure 4 is a sectional view of the plane 4-4 thereof.

A sound recording and playback apparatus is now to be generally described to show the unique application of the invention thereto.

Numeral ll) designates a turntable provided with a central shait for driving purposes, the said shaft carrying a central pin I2 on its upper end to engage both a record disc l3 and a driving flange M, the shaft and the motor drive system therefor not being shown in the drawing.

Numeral it? indicates a bearing secured to the rear of panel H on which is pivotally and yieldably mounted the overhead feed mechanism carrying the cutting head assembly of which the said flange i4 is a part. Zhe overhead feed mechanism generally consists of end blocks l6 and i! to which are secured by means of nuts l8 overlying spacing rods l9, penetrating the said end Figure 1 through blocks l6 and I1 through orifices IS, the end block I! being secured to a pivot member 20. A lead screw 2| is secured between blocks 16 and I l, the lead screw having a cutting head carriage 22. Rearwardly of the cutting head carriage 22 are orifices 23 through which rods I 9 penetrate while intermediately of the head carriage 22 are provided means for detachable and threaded en gagement of the carriage head 22 with the lead screw 2|, said means not. being shown in detail on the drawing.

A cutting head 24 is suitably and adjustably secured to the forward portion of cutting head carriage 22, the said cutting head 24 being preferably of the electro-magnetic type and having a stylus 25 secured thereto. Knurled knobs 26- and 27 which facilitate the insertion, removal and substitution of lead screws 2| in tension bearings secured to end blocks l6 and IT project from the ends of the said tension bearings, the latter being diagrammatically indicated by numerals 28 and H The lead screw 2| is driven by means of a driving flange l4 heretofore mentioned having an upwardly extending shaft 30 and a top cap member 3 l. A gear not shown on the drawing is provided on one end of the leadscrew 2| and is disposed within end block 16, the said gear meshing with another worm gear not shown, mounted on the shaft 30, the said worm gear being enclosed in a housing 32 secured to endblock 16. The driving flange I4 is provided with a plurality of orifices 33, 34 and 35 to engage pins not shown on turntable l0 whereby the said driving flange I4 is made to rotate with the turntable.

The recording device, where desirable, is pro- U vided with a playback of the electro-magnetic type or any other type, the said playback having a support 38 on which arm 3 is pivoted and a pickup mechanism 36 secured to the said arm 31.

Applicants invention consists of a mounting means for the overhead feed mechanism of a re cording device above described. Any relative change in position between pin 12 on turntable l0, bearing I5 supporting the overhead feed mechanism and axial displacement of the feed assembly itself will induce stresses and strains in the fit between the driving flange l4 and the pin it thereby creating an impairment of constant rotational velocity of turntable l0 and the possibility of non-registration at all between pin I 2 and the driving flange I4. ments may be caused by slight defects in assembly, by temperature changes, by adjustments and by a slight loosening of parts.

Such displace- The mounting means for the overhead feed mechanism permits rotational movement of driving flange l4 in the horizontal plane, vertically pivotal movements relative to the horizontal plane and movement along the axis of the overhead feed mechanism.

Bearing I is provided with a central vertical orifice in which a shaft 43 is adapted to rotate, the said shaft 43 at the lower portion being provided with a reduced narrow peripheral portion 40, the surface of which is rotatably engaged by a screw 4| penetrating bearing l5. Thus shaft 43 is rotatably mounted on bearing l5, and is provided with slight vertical movement by virtue of the fact that the reduced peripheral portion 40 is of slightly greater width than screw 4|. Shaft 43 is provided with a peripheral flange 42 above the upper surface of bearing l5, the top portion of shaft 43 above flange 42 being reduced to form a diametrical key member 43. The diametrical key member 43' is engaged by a circular base 44 of a yoke having ears 45 and 45, the said circular base 44 being provided with a diametrical recess 45 at the undersurface, the said recess 45' being adapted to engagekey portion 43'.

The base 44 is movably secured on a pin 47 in key portion 43 of shaft 43, the said pin penetrating the sides of recess 45 and an orifice 4B in the key portion 43' of shaft 43. In securing circular base 44 to key portion 43 by means of pin 41, a clearance is provided between the lower surface of base 44 and the upper surface of flange 42, the same amount of clearance being allowed between the base of recess 45 and the upper surface of key portion 43, the said. clearances being indicated by numerals 42' and 45". The size of clearances 42' and 45" control the degree of swiveling of base 44 forwardly and rearwardly about the axis of pin 41. The swiveling of base 44 causes a forward or a rear longitudinal move ment of the driving flange l4 when resting on disc l3 by virtue of the pivotal connection between the said overhead feed assembly and the yoke ears 45 and 46.

Thus, it is seen that the circular base 44 of the yoke has vertical play indicated by the clearance between reduced portion 40 and screw 4!. In addition, the base 44 is given a radial play limited by clearances 42 and 45" about the axis of pin 41 thereby effectuating a forward and rear axial movement for the overhead feed mechanism since the latter is pivotally connected to the cars 45 and 45 of the yoke member by means of the pivot member 20 mounted on pivots 49 and 55! secured to ears 45 and 46 respectively.

As a result of the aforedescribed mounting, the overhead feed mechanism connected to pivot member 28 is vertically swivelable between pivots 49 and 58; is rotatable in the horizontal plane through the affixation of the yoke base 44 to shaft 43; is given vertical play by virtue of the limited clearance between reduced portion 40 and screw 4|; and is given limited longitudinal movement at driving flange [4 by virtue of the clearances 42' and 45 and the pivotal connection between the overhead feed mechanism and ears 45 and I wish it understood that minor changes, and variations in the material, integration, spacing, size and arrangement of parts may all be resorted to without departing from the spirit of the invention and without departing from the scope of the appended claims.

I claim:

1. In a recording apparatus having an overhead feed assembly including a cutting head driven by a lead screw and a driving flange for the lead screw associated with the central pin of a turntable, a bearing standard, a shaft having an annular groove and being rotatably secured therein engaging means on the standard loosely fitting on said groove for effecting limited vertical displacement of said shaft, a connecting member having an upper yoke portion to which the overhead feed assembly is swivelably secured for vertically angular movement, the said connecting member having a base portion engaged to the shaft for limited longitudinal movement of the overhead feed assembly relative to the bearing standard.

2. In a recording apparatus having an overhead feed assembly including a cutting head driven by a lead screw and a driving flange for the lead screw associated with the central pin of a turntable, a bearing standard and a shaft rotably secured therein, a connecting member having an upper portion to which the overhead feed assembly is swivelably secured for vertically angular movement, the said connecting member having a base portion pivotally engaging the said shaft and swivelable therewith whereby the connecting member is given radial movement about the shaft thereby effectuating longitudinal displacement of the overhead feed assembly relative to the bearing standard.

3. In a recording apparatus having an overhead feed assembly including a cutting head driven by a lead screw and a driving flange for the lead screw associated with the central pin of a turntable, a bearing standard and a shaft rotatably secured therein, a connecting member having an upper portion to which the overhead feed assembly is swivelably secured for vertically angular movement, the said connecting member having a base portion swivelably engaging the said shaft to a limited degree, whereby the connecting member is given limited radial movement .about the said shaft.

4. In a recording apparatus having an overhead feed assembly including a cutting head driven by a lead screw and a driving flange for the lead screw associated with the central pin of a turntable, a bearing standard and a shaft rotatably secured therein, the said shaft having an annular flange above the top of the said standard and below the upper end of the said shaft, a connecting member having an upper portion to which the overhead feed assembly is swivelably secured for vertically angular movement, the said connecting member having a base portion adapted to engage the upper part of the said shaft above the upper surface of the flange, means to swivelably secure the said connecting member to the upper part of the shaft whereby the connecting member is given radial movement about the said shaft, the amount of radial movement being determined by the spacing between the upper surface of the flange and the bottom surface of the connecting member.

ISIDORE I-I. GOLDMAN. 

